unified API error response

modules/middleware/context.go

@@ -157,15 +157,22 @@ func (ctx *Context) HandleText(status int, title string) {
 	ctx.RenderData(status, []byte(title))
 }
 
-func (ctx *Context) HandleAPI(status int, obj interface{}) {
+// APIError logs error with title if status is 500.
+func (ctx *Context) APIError(status int, title string, obj interface{}) {
 	var message string
 	if err, ok := obj.(error); ok {
 		message = err.Error()
 	} else {
 		message = obj.(string)
 	}
+
+	if status == 500 {
+		log.Error(4, "%s: %s", title, message)
+	}
+
 	ctx.JSON(status, map[string]string{
 		"message": message,
+		"url":     base.DOC_URL,
 	})
 }